Abstract
The model generalizes the description of Dollins and Nichols by including pore size distributions. A thermal densification formulation is also derived. The results show that at T< 900° C, densification is independent of temperature and is mainly due to interstitial migration. In the range 1000–1350°C, vacancy diffusion and fission spike/pore interaction also interfere. Here, the densification rate decreases as the temperature rises and a slight porosity growth appears around 1300°C. Above 1500°C, pore coalescence is stimulated and the densification rates are enhanced. The predicted evolutions of pore size distributions, under irradiation at low temperatures and during resintering tests, are in reasonable agreement with experimental data.
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